A source with knowledge of the case said prosecutors scheduled the examination after the defense was allowed to introduce testimony on whether Sandusky has a mental disorder.

The trial is still scheduled to resume on Monday where prosecutors are expected to wrap up their case.

Throughout the week, a number of the alleged victims in the case took the stand to testify about alleged incidents with Sandusky.

On Friday, the court made a ruling that gives some insight into how Sandusky’s attorney plans to defend his client.

Judge John Cleland ruled that Jerry Sandusky can have an expert testify about a psychiatric condition that his lawyers say could explain his letters to boys as something other than grooming them to molest them.

Jurors will hear about what’s called histrionic personality disorder. In short, he may engage in dramatic or even inappropriate behavior to call attention to himself.

It is also likely the jury will hear from Dottie Sandusky, the wife of the accused, who according to two witnesses was nearby during some of the abuse. Her explanations and cross examination could be crucial for the defense.